Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o menor valor listado em serviço para um navio da classe xavery czernicki?
 ###Tabelas: CREATE TABLE economies_of_member_states (economies_of_member_states_id AUTO_INCREMENT PRIMARY KEY, Member State sorted by GDP VARCHAR, GDP in s billion of USD (2012) VARCHAR, GDP % of EU (2012) VARCHAR, Annual change % of GDP (2012) VARCHAR, GDP per capita in PPP US$ (2012) INT, Public Debt % of GDP (2013 Q1) VARCHAR, Deficit (-)/ Surplus (+) % of GDP (2012) VARCHAR, Inflation % Annual (2012) VARCHAR, Unemp. % 2013 M7 VARCHAR) CREATE TABLE mixed_doubles:_13_4_titles_9_runner-ups (mixed_doubles:_13_4_titles_9_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE careers (careers_id AUTO_INCREMENT PRIMARY KEY, Career Card VARCHAR, Starting career/salary VARCHAR, 2nd career/salary VARCHAR, 3rd career/salary VARCHAR, 4th career/salary VARCHAR, 5th career/salary VARCHAR, 6th career/salary VARCHAR) CREATE TABLE equipment (equipment_id AUTO_INCREMENT PRIMARY KEY, Vessel VARCHAR, Origin VARCHAR, Type VARCHAR, In service INT, Unit VARCHAR) CREATE TABLE most_goals (most_goals_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Nation VARCHAR, Career VARCHAR, Goals INT, Appearances INT)  
SELECT MIN In service FROM equipment WHERE Vessel = xavery czernicki class